Modding Aikido to non-Aikido such as SRPP? - diyAudio
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Old 23rd September 2012, 11:09 PM   #1
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Location: Maryland, USA
Default Modding Aikido to non-Aikido such as SRPP?

Hi there,

I planned Aikido (6SN7) preamp long time ago, and collected many good parts: dual mono power supplies (DC heater, CLC HV), stepped attenuator volume, relay selector board, very nice chassis, etc.

I finally had some time during this Summer and finished it, but with big disappointment. There's hum, and it increases as I turn the volume. I have much experience with many different types of analog electronics, I have read almost all threads related to removing hum of Aikido, but I am now out of my patience now.

It would be greatly appreciated if someone can suggest me a spot-on tip to remove hum from Aikido which increases as the volume turned.
But I would also like to ask if there has been anyone converted Aikido (6SN7) to other pre circuit such as SRPP. I have 300V B+ and 6V heater. I wouldn't mind using only one 6SN7 per channel.

Thanks in advance,

Doug
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